Coil winding number variable type motor and coil winding number varying method for varying cooling and heating capacity of reciprocating compressor

Abstract

A coil winding number variable type motor for varying a cooling and heating capacity of a reciprocating motor includes: a plurality of coils separately wound and connected in series to each other so as to vary turn ratio among motor coils; a plurality of relays respectively connected between adjacent coils among the plurality of coils; and a relay controller for outputting and ON / OFF control signal for varying the winding number of the motor coil and controlling the relays according to a change in a load and a power supply voltage. The coil wound in the motor of the reciprocating compressor is divided into the main coil and the plurality of sub-coils and the winding number of the motor coil is varied by itself to control the stroke of the reciprocating compressor, thereby effectively coping with the change in the voltage or the load.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a motor of a reciprocating compressor, and more particularly, to a coil winding number variable type motor that is capable of controlling a stroke by varying the number of windings of motor coil by itself, and a coil winding number varying method for varying cooling and heating capacity of a reciprocating compressor2. Description of the Background ArtFIG. 1 is a schematic block diagram showing the construction of an operation control apparatus of a reciprocating compressor in accordance with a conventional art.As shown in FIG. 1, the operation control apparatus includes a reciprocating compressor 10A for controlling a cooling capacity by varying a stroke through a linear movement of a piston (not shown), an electricity circuit unit 10 with a ground terminal connected between a current sensing resistance R1 and an AC switching device, that is, a triac (Tr1), and supplying a voltage and a current to t...

AI Technical Summary

Benefits of technology

Therefore, an object of the present invention is to provide a coil winding number variable type motor for varying a cooling and heating capacity of a reciprocating compressor that is capable of varying the number of winding, a capacity of a motor itself, by itself to cope with a load and a voltage change.

To achieve the above object, there is also provided a method for varying an electricity capacity of a coil winding number variable type motor for varying a cooling and heating capacity, including the steps of: judging the winding number of coil required for stroke control when a predetermined voltage is applied to a reciprocating compressor; applying a voltage only to a main coil and reducing the winding number of coil in case that occurrence of a great stroke is required for the reciprocating compressor; and applying a voltage to the main coil and a sub-coil and increasing the winding number of coil in case that occurrence of a small stroke is required for the reciprocating compressor.

Problems solved by technology

However, the conventional operation control apparatus of a reciprocating compressor has the following problems.

That is, in order to control the stroke, since the driving voltage applied to the motor of the reciprocating compressor is controlled by varying the ON / OFF period of the switching signal inputted to the triac, a noise is generated according to switching, a circuit such as a noise filter is additionally required to cancel the noise, resulting in that its expense is increased.

In addition, in case that the stroke is controlled by varying the ON / OFF period of the triac by switching, a power factor is influenced due to a harmonic wave, for which a circuit is additionally required, also resulting in that the expense is increased.

Moreover, due to a surge voltage (a voltage which is instantly increased), the triac is broken down, and due to the harmonic wave component generated by the triac, an efficiency of the reciprocating compressor is degraded.

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